Xine is a free gpl-licensed video player for unix-like systems. It plays mpeg-2 and mpeg-1 system (audio + video multiplexed) streams,
mpeg elementary streams (audio/video only, e.g. mp3 files) and
AVI files (using win32 codec dlls). Xine plays the video and audio data of the stream and synchronizes the playback of both. Depending on the properties of the stream, playback will need more or less processor power, full frame rate for mpeg-2 has been seen on a 400 MHz P II system.

Xine is on 1.1.7 as of June, 2007.

http://xinehq.de/

The FFmpeg project consists of two main parts: FFmpeg, which encodes and decodes the multimedia streams, and FFserver, which provides streams via HTTP for various multimedia clients. FFMpeg is completely portable since it does not rely on proprietary DLLs. The library libavcodec, which contains all the ffmpeg codecs, can be reused in any program licensed under the GNU General Public License.

Version 0.4.9 is shipping in March, 2007.

http://ffmpeg.sourceforge.net/

VLC is an Open Source multimedia player that supports your usual mix of audio and video formats. Support is currently included for MPEG-1, -2, -4, h.264, mp3, ogg and more. The site includes precompiled binaries for a really nice range of platforms, including Windows, Mac OS X, varios Linux flavors, and even BeOS!

Version 0.8.6 of this player is shipping as of June, 2007.

http://www.videolan.org/vlc/

The site says: FAAC is a MPEG4 GA (General Audio) encoder, that supports only the LOW and MAIN profile. Which are derived from MPEG2-AAC, adding some functionalities to further improve the bitrate efficiency (LTP and PNS).

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http://sourceforge.net/projects/faac/

FFDShow is DirectShow and VFW codec for decoding/encoding many video and audio formats, including DivX and XviD movies using libavcodec, xvid and other opensourced libraries with a rich set of postprocessing filters.

http://sourceforge.net/projects/ffdshow

Here Fraunhofer IIS institute provides description of it`s AAC related technologies.

http://www.iis.fraunhofer.de/EN/bf/amm/projects/mpeg/index.jsp

A lossless codec developed in Russia originally for radio telescope data. Apparently that specialized codec turned out to be good on audio data as well. Distributed under a free license.

http://tta.iszf.irk.ru/index.php?module=pagemaster&PAGE_user_op=view_page&PAGE_id=6&MMN_po
sition=21:21

Mp3stat is Linux a utility program to compare encoders against an MP3 that was VBR encoded. It outputs a linear graphical bitstream analysis of each MP3 being compared and gives you a breakdown of how many frames of each bitrate are found in the MP3. It basically allows you to see how encoders treat areas in the same MP3s differently and lets users discover some of the bitrate effects of different quality levels of the same encoder. Mp3stat also supports Oggs.

Version 2.5.10 of mp3stat is shipping as July 2004.

https://signal-lost.homeip.net/projects/

This is a simple class that reads default tags (the ones suggested by xiph.org) and the common “COMMENT” tag used by WinAmp and other players and tag editors.

http://codeproject.com/useritems/ogg_tag_reader.asp

OggPlay is an Ogg vorbis audio player for smartphones. I started working on this project in early April 2003. The 1st version for the SonyEriccson P800 was released end of April. Many people have contributed localized versions, new skins, documentation, and are helping with porting the application to other phones since then. OggPlay has become a true open source project

http://symbianoggplay.sourceforge.net/

JMAC is a Java implementation of the Monkey’s Audio decoder/JavaSound SPI. Currently, Monkey’s Audio format up to 3.97 version supported. JMAC is distributed under the terms of the GNU Library General Public License.

Version 1.65 of JMAC is shipping as of July, 2004.

http://jmac.sourceforge.net/

WMA To MP3 Converter was written for converting WMA to or from MP3/WAV files. So, with WMA to MP3 Converter, you may convert WMA to MP3, convert WMA to WAV, convert WAV to WMA, convert MP3 to WMA.

http://www.wma-to-mp3.net/

The MP3 Streaming DownSampler for PHP is written with cable modem/DSL users with low upstream caps in mind. Using LAME, it dynamically downsamples a requested MP3 to a bitrate which can be streamed. It doesn’t use temporary files, so you don’t have to take the time to do any batching, and you just give it a directory with symlinks to your music in a place the Web server can reach. The interface is simplistic and fast, meant for immediate plug and play access.

http://freshmeat.net/projects/mp3sds

This project is an attempt to port the free Speex voice codec to a pure Java implementation.

Version 0.9.4 is shipping as of June, 2004.

http://sourceforge.net/projects/jspeex/

FLAC is a port of the Free Lossless Audio Codec (FLAC) library to Java. This library allows java developers to experiment and write programs that use the FLAC algorithms.

Version 0.5 is shipping as of June, 2004.

http://jflac.sourceforge.net/

When listening to recordings of human speech (like audio books, conference recordings, …) it can be useful to have the ability to adjust the playback speed without changing the pitch of the recording. This simple command line program can do this for you. Playing a audio book at 150% of its original tempo is still intelligable and saves time, therefore the name of the program.

http://delysid.org/yatm.html

A perl script to convert FLAC or Shorten files to Ogg Vorbis.

http://home.mchsi.com/~stateq2/flac2ogg.html

MP3 To WAV Converter is designed for converting MP3 to WAV and converting WAV to MP3. It converts batches of MP3 to WAV or WAV to MP3 on-the-fly. Play MP3/WAV files, edit Mp3 file’s ID3 text, and search MP3 or WAV files from a folder or the whole disk.

http://www.mp3-to-wav-converter.com/

The author says:

This page offers very simple but very useful C source code to parse MP3 files. The parser gives detailed info of each frame in the MP3 file. It presents header info, side info and main data corresponding to each frame in the MP3 file. I was not able to find such a tool on the net so I did it myself and now I want to offer it to the world free of cost.

http://www.vlsiip.com/mp3eater.html

WavPack allows you to losslessly compress (and restore) both 16 and 24-bit audio files in the .WAV format. Unlike “lossy” compression schemes (like MP3) that discard information, WavPack converts the audio data into a more compact form so that the restored files are digitally identical to the original source. It’s somewhat like the file compression portion of WinZIP except that it’s optimized for audio data. Like other lossless compression schemes the data reduction varies with the source, but it is generally between 25% and 50% for typical popular music and somewhat better than that for classical music and other sources with greater dynamic range.

http://www.wavpack.com/

This is the free version of Shorten, which was forked from the commercial version from SoftSound. Not sure about all the legalities here, but I don’t think SoftSound is actively selling the commercial version, so this may be your only choice.

http://www.etree.org/shnutils/shorten/

This is a lossless audio compression format that has support for WinAmp and Windows Media Player. Retain perfect fidelity for your music recordings, at the cost of additional disk space.

Version 3.99 is shipping as of May, 2004.

http://www.monkeysaudio.com

Using your Windows PC to capture audio and perform an FFT on the captured sample.

http://www.codeproject.com/audio/waveInFFT.asp

The Speex project aims to build a patent-free, Open Source/Free Software voice codec. Unlike other codecs like MP3 and Ogg Vorbis, Speex is designed to compress voice at low bitrates in the 8-32 kbps/channel range. Possible applications include VoIP, internet audio streaming, archiving of speech data (e.g. voice mail), and audio books. In some sense, it is meant to be complementary to the Ogg Vorbis codec.

Speex 1.1.5 was released in April, 2004.

http://www.speex.org/

Tool for the building of simple avisynth script from which is possible to automate the video compression with any codec and audio files into the formats: Mp3, Ogg and Wav; the tool have also a Compress Test and a Bitrate/size calc.

http://sourceforge.net/projects/comptool/

An open source project aiming to create a free codec that supports the MPEG4 LOW and MAIN profiles. Currently available as a command line encoder and Win32 DLL.

Version 1.24 shipped in April of 2004.

http://faac.sourceforge.net/

VorbisSPI is a Java Service Provider Interface that adds OGG Vorbis audio format support to Java platform. It supports icecast streaming. It is based on JOrbis Java libraries.

http://www.javazoom.net/vorbisspi/vorbisspi.html

A managed C++ program to compress audio using the Windows Medai Audio codecs.

http://codeproject.com/useritems/WmaCompressor.asp

compaact! allows you to easily encode your audio files with the high quality coding algorithm MPEG-4 AAC (Advanced Audio Coding). compaact! is capable of multichannel encoding and comes with extensive audio preprocessing features to achieve even better encoding results.

Version 1.2 is shipping in April, 2004.

http://www.compaact.com/aacPage.php?SPRACHE=UK&PAGE=home

Decodes AC-3 audio from DVDs, or QuickTime audio, and spits back AIFF, MP3, or AAC files.

http://sourceforge.net/projects/mac3dec/